OMPHOBBY M4 Helicopter Main Rotor Damper Set OSHM4056 Sale! from 470 /per Qty. Add to Cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. This is a replacement main rotor damper set for the OMPHOBBY M4 Helicopters Contents Main Rotor Damper Φ5*Φ10*8 FKM85°-8 Qty available:3 SKU:OSHM4056